Stovepipe



NTTED STATES PATENT OFFICE.

THOMASS. EVANS, OF ST. LOUIS, MISSOURI.

STOVEPIPE.

SPECIFICATION forming part of Letters Patent No. 481,856, dated August30, 1892. Application led February 2, 1892.` Serial No. 420,060. (Nomodel.)

T0 all whom it may concern:

Be it known that I, THOMAS S. EVANS, of St. Louis, in the State ofMissouri, have invented certain new and useful Improvements inStovepipes; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it pertains t0 make and use it, referencebeing had to the accompanying drawings, which form part of thisspecification.

Myinvention relates to an improvement in stovepipes; and it consists incertain novel features of construction, which will be fully describedhereinafter, and more particularly referred to in the claim at the endof this specication.

The object of my invention is to provide an improved lock for theengaging edges of stovepipe-joints, whereby when the ends of the sameare compressed, so as to fit within the adjacent joints, the said edgesWill not become disengaged, but will be more securely fastened togetherby the pressure exerted thereon.

Referring to the accompanying drawings, Figure lis a perspective View ofa joint of pipe provided with my improved lock. Fig. 2 is a similarview, the edges being in engagement.

A represents the pipe-blank, one edge of which is overturned its Wholelength to form the lip B, as shown. The opposite edge is bent slightlyoutward, as shown at O, the said outward bulge beginning at a slot cutinto the said edge a short distance from the end of the joint andextending to the opposite end thereof. This bulged portion is thenformed with an inwardly-turned lip D, which engages the lip B in theusual manner. The portion of the edge E between the slit C and the endof the pipe is bent inward, as shown, so that vwhen the lips B and D arein engagement the end of the former will rest upon the portion E, asshown in Fig. 2. Portions of the edge O being on both sides of the edgeB, as shown in Fig. 2, it will be seen that a stop is-formed at thepoint O', thus rendering it impossible for the edges of the end A of thepipe to become disengaged when contracted for thepurpose of coupling itwith another pipe-section. By this means a very secure lock is formedand there is no danger of the edges becoming disengaged from pressure injoining the sections. 'lhe oppositeend of the pipe-section being the oneto overlap, the next adjacent section is prevented from spreading by theengagement of the lips B and C.

In order to engage the scctionvedges it is necessary to slightly twistthe edge B untilit is pushed back suflieiently far to clear the pointC', so as to pass over the depressed portion E.

Having thus described my invention, I Claim- In a stovepipe, thecombination, with a blank, of an outturned lip formed on one edge of thesame, the opposite edge Ot' the blank being formed with a transverseslot, an inturned lip formed on said edge between'the slot and one endof the pipe, and the portion of the said edge between the slot and theopposite end of the pipe bulged inward,.sub stantially as and for thepurpose shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

THOMAS S. EVANS.

NVitnesses:

FRANKLIN R. JAcKEs, A. R. WILCOX.

